Fix exception handling and stale trace context in distributed tracing

[Copilot]

Three correctness issues in the distributed tracing implementation identified during review.

Changes

• DurableTaskGrpcWorker.java: Replace catch (Throwable e) { throw e; } with explicit Error rethrow + RuntimeException wrap — preserves Error type identity and avoids ambiguous re-throw semantics.

• TaskOrchestrationExecutor.java: Explicitly set parentTraceContext = null when ExecutionStartedEvent has no parent trace context. Previously, a stale context from a prior execution could leak into activities/sub-orchestrations during continue-as-new or replay.

• OrchestrationRunner.java: Narrow catch from Throwable to Exception (prevents wrapping Errors like OutOfMemoryError); move orchestrationScope.close() to finally to guarantee cleanup.

Pull request checklist

• My changes do not require documentation changes
  • Otherwise: Documentation issue linked to PR
• My changes are added to the CHANGELOG.md
• I have added all required tests (Unit tests, E2E tests)

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